Probing $Z^{\prime }$ Mediated Charged Lepton Flavor Violation with Taus at the LHeC

Abstract

While charged lepton flavor violation (cLFV) with taus is often expected to be largest in many extensions of the Standard Model (SM), it is currently much less constrained than cLFV with electrons and muons. We study the sensitivity of the LHeC to $e$-$\tau$ (and $e$-$\mu$) conversion processes $p{e}^{-}\to {\tau }^{-}+j$ (and $p{e}^{-}\to {\mu }^{-}+j$) mediated by a $Z^{\prime }$ with flavor-violating couplings to charged leptons in the $t$-channel. Compared to current tests at the LHC, where cLFV decays of the $Z^{\prime }$ (produced in the s-channel) are searched for, the LHeC has sensitivity to much higher $Z^{\prime }$ masses, up to O(10) TeV. For cLFV with taus, we find that the LHeC sensitivity from the process $p{e}^{-}\to {\tau }^{-}+j$ can exceed the current limits from collider and non-collider experiments in the whole considered $Z^{\prime }$ mass range (above $500$ GeV) by more than two orders of magnitude. In particular for extensions of the SM with a heavy $Z^{\prime }$, where direct production at colliders is kinematically suppressed, $e-\tau$ conversion at LHeC provides an exciting new discovery channel for this type of new physics.

6 pages, 5 figures

References in corpus (5)

• An Introduction to PYTHIA 8.2
• $B_s-{\bar{B}}_s$ Mixing constraints on FCNC and a non-universal $Z^{\prime }$
• Precision predictions for Z'-production at the CERN LHC: QCD matrix elements, parton showers, and joint resummation
• Flavor physics induced by light $Z^{\prime }$ from SO(10) GUT
• Lepton Flavour violation in muon decays

Cited by in corpus (5)

• The Large Hadron-Electron Collider at the HL-LHC
• Search for Mono-Higgs Signals in $b\bar{b}$ Final States Using Deep Neural Networks
• Searching for charged lepton flavor violation at $ep$ colliders
• Search for heavy Majorana neutrinos in the $\tau$ final state at proton-electron colliders
• Charged lepton flavor violation associated with heavy quark production in deep inelastic lepton-nucleon scattering via scalar exchange